Bed-plate for paper-pulp engines



O. MGRSE. Bed-Plate for Paper-Pulp Engines.

No. 226,098 lPa'uantecl Mar.y 30,1880.

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N. PETERS. PHOYDJJTHGGRAFHER. WASHINGTN. D C.

UNITED STATES EEicE.

ATENT BED-PLATE vFOR PAPER-PULP ENGINES.

SPECIFICATION forming part of Letters Patent No. 226,098, dated March30, 1880. Application filed February 19, 1880.

Needham, county of Norfolk, State of Massa.

chusetts, have invented certain Improvements in Bed-Plates forPaper-Pulp Engines, of which the following is a speciiication.

In this bed-plate the grinding-knives, which are thin iiat blades ofsteel of uniform size, are bolted securely and permanently togetherwithintermediary division-bars of wood, which wear down simultaneouslywith the knives, the grindingbed thus composed being contained bodilywithin abox or case adapted to closely receive it, and having provisionfor enabling the bed to be raised to compensate for the wear upon itsupper surface, the box being further provided with means for raising thebed as occasion requires, and which, in the present instance, is anadjustable shifting bottom, capable of being raised and lowered by meansof a screw-threaded rod, the head of which extends outside of the boxand is readily accessible.

I consider my invention in this bed-plate to consist in the movablegrinding-bed as composed of alternate knives and division-bars, coniinedpermanently together and contained within a box or case which hasprovision for raising the bed bodily as it wears.

rIhe drawings accompanying this speciiication represent, in Figure 1, aperspective view, and in Figs. 2 and 3 vertical sections, of a bedplatecontaining my invention, while Fig. 4 is a perspective view of thelifter-bar. y

In said drawings, the grinding-bed is shown at A as composed ofalternate bars of met-al and wood bolted permanently together, theformer being shown at a a, 815e., as composed of sheet-steel and ofuniform size, and constituting the grinding-knives, while the latter, bb, Sto., are of like length and width as the steel blades, but ofgreater thickness, and constitute division-bars to separate the knivesand provide the requisite grinding bed or surface, the wood being ofsuch soft texture as practically to offer no resistance to the grindingprocess.

Grinding-beds composed of alternate bars of steel and wood have been inuse for many per se, though I consider the peculiar arrangement of theknives, as hereinafter described, to be original with myself.

rEhe grinding-bed A is deposited within a rectangular box or case, B, ofcast-iron, of a size to closely receive it and permit it to rise Withinit, the bed being steadied or clamped within such box by horizontalbolts c c, 85e., passing through the box below the bed and playingwithin vertical slots d d, Snc., in the sides of the box,-while, inaddition tothese main bolts, I employ a bolt, e, at each upper corner ofthe box outside of the bed, to confine the upper edges of the sides ofthe box together and'closely hug the grinding-bed to prevent shaking' ofthe latter.

The bottom of the bed, which is iiat, rests upon va shifting oradjustable bottom, which, in the present instance, is composed asfollows: Upon the lat bottom of the box or case B, I place a bar, C, ofmetal, composed of a series of blocks, a a', &c., dat upon, their underside, and having their upper surface formed of inclined planes c e,Ste., of easy ascent, and sloping in a uniform direction, thislifter-bar G being of less length than the interior of the box, andbeing moved longitudinally backward or forward in the latter by means ofa screwthreaded rod, f, which screws through the entire length of thebar, and has a head, g, which lies up against the front end of theexterior of the box.

By turning the rod f in one direction (to the right) the lifter-bar C isdrawn toward the front end of the box, while reversing the movement ofthe rod permits the bar to be pushed in the opposite direction or byswiveling one end of the rod within the end of the box the bar would bepushed inward by the rotation of the rod.

Upon the top of each slope or incline e of the bar C, I place a block orwedge, D, the upper surface of which is horizontal, in order that theseries ma)r provide a flat surface or base to receive the grinding-bed,and each block sloping on its under side to correspond with each slope eof the bar.

The number of the wedge-blocks D D is equal 1 to that of the bolts c,and each Wedge is channeled transversely upon its upper side toreceive abolt, c, in order to prevent end-play of the series of wedges-that is,of the shifting base or bottom of the grinding-bed, and com- IOO pelsuch bottom, as the wedge-bar is advanced by the rotation ofthe screw,to rise.

\Vhen the bed-plate above described is new the wedge-bar stands at itsinmost extreme within the box, and consequently the grindingbed is inits lowest position and with its upper or grinding surface projectingsomewhat above the upper margin of the box, the bolts c being screwed upsufcieutly tight to prevent chattering of the bed within the box, butyet permit ot' such bed being raised within the box by means of thescrew and wedge-bar.

In order that the head of the screwf may be readily accessible, anopening` should be made in the wall ot' the pulp-engine opposite suchhead, which permits of the use of a wrench, and by giving a slight turnto the screw daily to compensate for the wear upon the bed the latteralways stands a uniform height above the box-a matter of greatimportance.

I do not coniine myself to the shifting bottom as composed of thewedge-blocks and lifterbar, as this construction may be variedconsiderably without losing sight of the essential feature of myinvention, which I consider to embrace a bed-plate containing agrinding-bed adjustable vertically within its box and raised upon and bya shifting bottom susceptible of being' actuated from the outside of thebox. For instance, in lieu of the wedgebar and wedge-block, a series ofeccentrics mounted upon horizontal transverse shafts may beemployed toeffect the elevation of the grindingbed.

The arrangement or disposition ofthe knives and division-bars ispeculiar-that is, I employ three parallel clamping or steadying plates,L It and t', the former being the outside bindingplates and the latteran intermediate plate, which extends centrally of the bed and dividesthe two series of knives, and serves as a support for the inner endsofthe latter. These two series of knives are each arranged obliquely tothe longest plane ofthe bed, and so as to con verge at one end of thelatter, as shown in Fig. l of the drawings. By this arrangement of theknives I produce a drawing cut'at two different angles, which I havefound highly efcient in preventing clogging of the bed.

I claiml. A bed-plate for paper-pulp engines composed of the followingelements: a stationary outer box or case, an adjustable grinding-bedcomposed or altern atin gv bars of wood and metal conined permanentlytogether and deposited within the box, and a shifting base or supportintermediate between the bottom of the box and the adjustable bed, andadapted to raise the bed to compensate for wear.

2. The adjustable or shifting base or support for the grinding-bed,composed ofthe lifter-bar with its series ot inclined planes, andoperated by a screw or its equivalent, and the wedgeblockshavingcorrespondingly sloping bottoms to operate with such inclinedplanes, the blocks being prevented from end-play within the box bysuitable means, and the whole operating as explained.

3. The wedge-blocks a a D D, Ste., and screw-threaded rod, incombination with and operating between the bottom of the box and theunder side of the grinding-bed, substantially as stated.

4. In combination, the outer box or case, the grinding-bed, the wedge orlifter bar and its actuating-screw, the series of wedge-blocks betweenthe bed and lifter-bar, and the bolts extending through the box andblocks, all substantially as shown and explained.

OLIVER MORSE.

Witnesses F. CURTIS, H. E. LODGE.

